Stroller frame



FIG. 1 is a perspective view of the stroller frame;

FIG. 2 is a right view thereof;

FIG. 3 is top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof. 

CLAIM The ornamental design for a stroller frame, as shown and described. 